Electrolyte water is too hard to drink before a colonoscopy and can be taken in small amounts. Electrolyte water drunk before colonoscopy generally refers to the aqueous solution of compounded polyethylene glycol electrolyte bulk, which is a laxative commonly used before colonoscopy. Doing proper exercise after taking the medicine promotes intestinal peristalsis, thus achieving the purpose of cleansing the intestinal tract. The day before taking electrolyte water, you need to eat a light diet, such as millet porridge, noodles and other liquid or semi-liquid diet. If patients find the aqueous solution of Compound Polyethylene Glycol Electrolyte Bulk too hard to drink in one go, they can take it in several times. It should be noted that it is forbidden for patients who are allergic to Compound Polyethylene Glycol Electrolytes, gastrointestinal obstruction, intestinal perforation, gastric retention, gastrointestinal hemorrhage, toxic enterocolitis, toxic megacolon; and it should be used with caution for patients with severe ulcerative colitis. Compound Polyethylene Glycol Electrolyte Dispersant needs to be taken under the guidance of a doctor and should not be used without authorization.